Recent answers to Can I return to my state of an account in Firefox Syns a day ago?https://support.mozilla.org/en-US/questions/9489822013-01-31T13:22:19-08:00Think a about the daily backup for each user.
2013-01-31T13:22:19-08:00Cvboyjhttps://support.mozilla.org/en-US/questions/948982#answer-403680

Think a about the daily backup for each user.

STOP PANIC!forgot that I have yesterday's backup.lol
2013-01-31T13:19:44-08:00Cvboyjhttps://support.mozilla.org/en-US/questions/948982#answer-403678

There is no way to access your Sync account. It is encrypted and we don't restore data. Any backups 2013-01-31T12:48:02-08:00Tylerdownerhttps://support.mozilla.org/en-US/questions/948982#answer-403670

There is no way to access your Sync account. It is encrypted and we don't restore data. Any backups that happen are only for catastrophic failure of the servers, we can't individually restore data.

but you make a backup server daily. I have been there story for a few years.
2013-01-31T12:21:43-08:00Cvboyjhttps://support.mozilla.org/en-US/questions/948982#answer-403661

but you make a backup server daily. I have been there story for a few years.

Sorry, Right now we don't have that option
visit the Firefox SYNC FAQ
https://support.mozilla.org/e2013-01-31T08:44:11-08:00iamjayakumarshttps://support.mozilla.org/en-US/questions/948982#answer-403589